CN112864622B - Beam direction control method and device based on arc array antenna - Google Patents
Beam direction control method and device based on arc array antenna Download PDFInfo
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Abstract
The invention discloses a method and a device for controlling the beam direction based on an arc array antenna, wherein the method comprises the following steps: determining a first direction according to the target position and the circle center corresponding to the arc array antenna; controlling each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted based on the first direction to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same; determining a target direction of a synthesized beam based on an initial direction of the synthesized beam of the first antenna array tuple and a target position; determining a target radiation direction of a radiation beam of each antenna element based on the target direction of the synthesized beam; and adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction so as to control the beam direction synthesized by the radiation beam of each antenna array element to be the target direction.
Description
Technical Field
The invention relates to the technical field of phased array radar antennas, in particular to a method and a device for controlling a beam direction based on an arc array antenna.
Background
The resolution of the synthetic aperture radar from the range domain can be obtained by increasing the bandwidth of the transmitted pulse, and the limitation of the high resolution is reflected in the azimuth domain. With the research of the understanding of the synthetic aperture, it is gradually recognized that increasing the synthetic aperture length in the azimuthal direction broadens the azimuthal spectrum and thus higher resolution can be obtained. The special synthetic aperture of the arc-shaped array antenna enables the spectrum range of the arc-shaped array antenna in the distance direction and the azimuth direction to be expanded widely, so that the resolution in the distance direction and the azimuth direction is improved, 360-degree observation angle range observation is carried out around a target area, and target characteristics of a full visual angle can be obtained. According to the corresponding relation between the spatial resolution of the target area and the spatial frequency spectrum, the width of the spatial frequency spectrum needs to be increased when the target resolution is increased. The arc array antenna adopts a special structure and a beam synthesis method to obtain radar signals of a target area, and can obtain space spectrum widths in a distance direction and an azimuth direction to a greater extent than a straight line array and a planar array in an implementation mode, so that high resolution in two directions is obtained.
The phase shift value of each antenna element in the arc array antenna is not equal to the maximum value of the required beam pointing
θ0Besides the relation, the spatial position coordinate (x) of each array element on the arc-shaped array surface is also relatedi，yi，zi) In relation to this, the beam control code of each array element needs to be calculated separately, and in the case of a broadband signal, time delay compensation is needed. The phase relation between each array element is different from that of a linear array and a planar array, a simple linear relation does not exist, and the wave beam control signal of each array element needs to be calculated independently. Because the antenna elements of the arc array antenna are arranged on the arc curved surface, even though the directional diagrams are the same in shape, the maximum point directions can be in different directions due to the spatial position difference, and the maximum direction of the comprehensive directional diagram of the array is required to be obtained
θ0The amplitudes of the transmitted and received signals of each array element in this direction will not be equal, and thus the pattern factor of the array element
And cannot be directly applied to the array pattern function as a common factor. In order to meet the requirements of certain antenna side lobe level, adaptive lobe nulling and the like, the antenna side lobe level and the adaptive lobe nulling are required to be set
Satisfy the requirement of a certain antenna aperture weighting function, namely, require the amplitude weighting coefficient a0iCan follow the arcThe aperture of the radiation part in the array antenna changes and the maximum value of the antenna beam direction changes correspondingly, so the operation amount of the arc array antenna beam control system is increased, and the control of the beam direction of the arc array antenna is complex and inflexible.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for controlling the beam direction based on an arc array antenna, which are used for solving the problem that the beam direction control of the arc array antenna in the prior art is more complicated.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme: a control method for beam direction based on an arc array antenna comprises the following steps:
determining a first direction according to the target position and the circle center corresponding to the arc array antenna;
controlling each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted based on the first direction to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same;
determining a target direction of a synthesized beam based on an initial direction of the synthesized beam of the first antenna array tuple and a target position;
determining a target radiation direction of a radiation beam of each antenna element based on the target direction of the synthesized beam;
and adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction so as to control the beam direction synthesized by the radiation beam of each antenna array element to be the target direction.
Optionally, the method further includes:
grouping each antenna array element in the arc array antenna according to the principle that the interval distance between two adjacent antenna array elements in the same antenna array element group is equal to obtain a plurality of antenna array elements;
determining a synthesized beam direction of each antenna array group with working signal frequency as first signal frequency, and taking the synthesized beam direction as an initial direction of a synthesized beam;
and obtaining a beam direction range corresponding to each antenna array group based on the initial synthesized beam direction of each antenna array group.
Optionally, the controlling, based on the first direction, each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be turned on serves as a working antenna array element, and specifically includes:
comparing the first direction with the synthetic beam direction range of each antenna array group to determine the synthetic beam direction range in which the first direction is located;
determining an antenna array tuple corresponding to the synthetic beam direction range as a first antenna array tuple according to the determined synthetic beam direction range;
and controlling the conduction of each antenna array element in the first antenna array element group to be used as a working antenna array element.
Optionally, the target radiation direction of the radiation beam of each antenna element is determined based on the target direction of the synthesized beam; the method specifically comprises the following steps:
taking the initial direction of the synthesized beam of the first antenna array tuple as a zero beam direction;
determining a synthetic beam offset angle according to the zero beam direction and the target direction of the synthetic beam;
determining an offset angle of a radiation beam of each antenna array element in the first antenna array element group based on the synthesized beam offset angle;
determining a target radiation direction of the radiation beam based on the offset angle of the radiation beam.
Optionally, each antenna array element in the first antenna array element group is respectively and correspondingly provided with a phase shifter;
the adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction to control the beam direction synthesized by the radiation beam of each antenna array element to be the target direction specifically includes:
determining a central angle corresponding to each antenna array element in the first antenna array element group based on the zero beam direction;
calculating to obtain target signal frequency corresponding to each antenna array element in the first antenna array element group by using a first calculation formula and a second calculation formula based on the target radiation direction of each antenna array element, the central angle corresponding to each antenna array element, the transmission line distance between two adjacent antenna array elements in the first antenna array element group, the aperture angle of the arc array antenna, the total number of the antenna array elements of the arc array antenna and the arc distance between the antenna array elements of the arc array antenna;
and adjusting the initial signal frequency according to the target signal frequency by utilizing the phase shifter corresponding to each antenna array element to output the target signal frequency to the corresponding antenna array element, so that the synthesis direction of the radiation wave beam of each antenna array element is the target direction.
Optionally, the first calculation formula is:
the second calculation formula is: f = c/λ;
wherein, γiThe target radiation direction of the ith antenna array element is;
θia circumferential angle corresponding to the ith antenna array element;
the arc spacing between array elements on the arc array;
m is the total number of array elements;
λ is the signal wavelength;
λgis the wavelength;
l is the length of the transmission line between the two antenna array elements;
b is a positive integer;
f is the signal frequency;
and c is the speed of light.
Optionally, the method further includes determining a transmission line type;
when the type of the transmission line is determined to be a non-dispersive transmission line, the λg= λ; wherein λ is the signal wavelength;
when the type of the transmission line is determined to be a waveguide type transmission line,
wherein a is the broadside dimension of the waveguide;
λgis the in-guide wavelength of the waveguide;
λ is the signal wavelength.
In order to solve the above problem, the present invention provides a beam direction control device based on an arc array antenna, including:
the first determining module is used for determining a first direction according to the target position and the circle center corresponding to the arc array antenna;
the first control module is used for controlling the conduction of each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna based on the first direction to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same;
a second determining module, configured to determine a target direction of a synthesized beam based on an initial direction of the synthesized beam of the first antenna array tuple and a target position;
a third determining module, configured to determine a target radiation direction of the radiation beam of each antenna element based on the target direction of the synthesized beam;
and the adjusting module is used for adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction so as to control the beam direction synthesized by the radiation beams of each antenna array element to be the target direction.
The embodiment of the invention has the beneficial effects that: through confirming the work of corresponding a set of antenna array element according to the first direction, can realize the switching of antenna beam in big position like this, then through the radiation beam direction of adjusting each antenna array element according to the target direction again, just can realize the scanning in the small angle range under big position, from this can omnidirectional target detection, arc array antenna beam point to more nimble, and control process is comparatively simple.
Drawings
Fig. 1 is a flowchart of a method for controlling a beam direction based on an arc array antenna according to an embodiment of the present invention;
fig. 2 is a flowchart of a beam direction control method based on an arc array antenna according to another embodiment of the present invention;
FIG. 3 is a block diagram of another embodiment of a beam direction control device based on an arc array antenna according to the present invention;
fig. 4 is a schematic layout diagram of antenna elements in an arc array antenna according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control system based on the beam direction of an arc array antenna according to an embodiment of the present invention;
fig. 6 is a schematic layout diagram of antenna elements in an arc array antenna according to an embodiment of the present invention.
Detailed Description
Various aspects and features of the present application are described herein with reference to the drawings.
It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with a general description of the application given above and the detailed description of the embodiments given below, serve to explain the principles of the application.
These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the attached drawings.
It should also be understood that, although the present application has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of application, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application of unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.
An embodiment of the present invention provides a method for controlling a beam direction based on an arc array antenna, as shown in fig. 1, including the following steps:
step S101, determining a first direction according to a target position and a circle center corresponding to an arc array antenna;
in this step, as shown in fig. 2, after the target position a is determined, it may be determined that a connection direction of the target position and the arc array is a first direction;
step S102, controlling each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted based on the first direction to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same;
in this step, before determining to select the antenna array element group corresponding to the first direction, each antenna array element in the arc array antenna needs to be grouped according to the principle that the interval distance between two adjacent antenna array elements in the same antenna array element group is equal to obtain a plurality of antenna array element groups, so that when the working signal frequencies of each antenna array element in the same group are the same, the synthetic beam direction of the antenna array element group is the connecting line direction of the circle center and the center of the arc corresponding to the antenna array element group, that is, the direction is the initial direction of the synthetic beam, and thus the initial direction of the synthetic beam of each antenna array element group can be obtained. When the antenna array group is specifically selected, the first direction can be compared with the initial direction of the synthesized beam of each antenna array group, and the antenna array group corresponding to the initial direction is taken as the first antenna array group when the first direction is close to the initial direction, so that the control of the change of the pointing direction of the synthesized beam in a larger angle (direction) can be realized by selecting the corresponding antenna array group.
Step S103, determining the target direction of the synthesized beam based on the initial direction and the target position of the synthesized beam of the first antenna array tuple;
in this step, in a specific implementation process, an initial direction of a synthesized beam of the first antenna array tuple may be used as a zero beam direction (as indicated by a 0# beam direction shown in fig. 4); and determining a synthetic beam offset angle alpha according to the zero beam direction and the target direction of the synthetic beam so as to determine the target direction of the synthetic beam.
Step S104, determining the target radiation direction of the radiation beam of each antenna array element based on the target direction of the synthesized beam;
in this step, in a specific implementation process, the offset angle of the radiation beam of each antenna array element in the first antenna array element group may be determined based on the synthesized beam offset angle; a target radiation direction of the radiation beam is then determined based on the offset angle of the radiation beam.
Step S105, adjusting the radiation direction of the radiation beam of each antenna element to the target radiation direction, so as to control the beam direction synthesized by the radiation beams of each antenna element to be the target direction.
In this step, each antenna array element is correspondingly provided with a phase shifter. After the antenna synthesized beam is converted in a large azimuth by selecting the corresponding antenna array group, the direction of the synthesized beam can be flexibly controlled by scanning in a small-angle range in the azimuth by utilizing the phase shifter.
Another embodiment of the present invention provides a method for controlling a beam direction based on an arc array antenna, as shown in fig. 2, including the following steps:
step S201, grouping antenna array elements in the arc array antenna according to the principle that the interval distance between two adjacent antenna array elements in the same antenna array element group is equal to obtain a plurality of antenna array element groups; determining a synthesized beam direction of each antenna array group with working signal frequency as first signal frequency, and taking the synthesized beam direction as an initial direction of a synthesized beam; and obtaining a beam direction range corresponding to each antenna array group based on the initial synthesized beam direction of each antenna array group.
In this step, in a specific implementation process, after the initial direction is determined, since a certain rotation interval exists between the initial directions of beams formed by combining two adjacent antenna array elements, that is, a variation of a beam forming direction of the arc array antenna, a range can be determined according to the rotation interval and the initial direction of the beams. The number of the antenna array elements in each antenna array group can be determined according to actual needs, the number of the antenna array elements is different, the beam width obtained by synthesis is different, and the number of the antenna array elements in the antenna array group meets the following requirements: the deviation between the antenna array element and the expected direction (the target direction of the synthesized beam) needs to be less than half of the 3dB beam width of a single antenna array element, and the number of the antenna array elements in the antenna array group can be determined by rounding the gating number of the array elements meeting the requirement.
Step S202, determining a first direction according to the target position and the circle center corresponding to the arc array antenna;
step S203, comparing the first direction with the synthetic beam direction range of each antenna array group, and determining the synthetic beam direction range in which the first direction is positioned;
determining an antenna array tuple corresponding to the synthetic beam direction range as a first antenna array tuple according to the determined synthetic beam direction range;
and controlling the conduction of each antenna array element in the first antenna array element group to be used as a working antenna array element.
In this step, each antenna array element group of the arc-shaped array antenna is respectively and correspondingly provided with a matrix switch, as shown in fig. 5, each antenna array element in each antenna array element group is respectively and electrically connected with an output end of the matrix switch corresponding to the antenna array element group, so that each antenna array element of the antenna array element group is controlled to be conducted by using the matrix switch. Each specific matrix switch is in communication connection with a directional coupler, and the directional coupler outputs a control signal to control the corresponding matrix switch to work so as to control a group of antenna array elements corresponding to the matrix switch to be conducted by using the matrix switch.
Step S204, determining the target direction of the synthesized beam based on the initial direction and the target position of the synthesized beam of the first antenna array tuple;
step S205, taking an initial direction of the synthesized beam of the first antenna array tuple as a zero beam direction; determining a synthetic beam offset angle according to the zero beam direction and the target direction of the synthetic beam; determining an offset angle of a radiation beam of each antenna array element in the first antenna array element group based on the synthesized beam offset angle; determining a target radiation direction of the radiation beam based on the offset angle of the radiation beam.
Step S206, adjusting the radiation direction of the radiation beam of each antenna element to the target radiation direction, so as to control the beam direction synthesized by the radiation beams of each antenna element to be the target direction.
In this step, a phase shifter is correspondingly arranged on each antenna array element in the specific implementation process. Then, determining a central angle corresponding to each antenna array element in the first antenna array element group based on the zero beam direction; targets based on each of said antenna elementsThe method comprises the following steps that the target signal frequency corresponding to each antenna array element in a first antenna array tuple is obtained through calculation by utilizing a first calculation formula and a second calculation formula, wherein the radiation direction, the central angle corresponding to each antenna array element, the transmission line distance between two adjacent antenna array elements in the first antenna array tuple, the aperture angle of an arc array antenna, the total number of the antenna array elements of the arc array antenna and the arc distance between the antenna array elements of the arc array antenna are obtained through calculation by utilizing a first calculation formula and a second calculation formula; and finally, adjusting the initial signal frequency by utilizing the phase shifter corresponding to each antenna array element according to the target signal frequency to output the target signal frequency to the corresponding antenna array element, so that the synthesis direction of the radiation wave beam of each antenna array element is the target direction. Wherein the first calculation formula is:
wherein, γiIs the target radiation direction of the ith antenna element, thetaiA circumferential angle corresponding to the ith antenna array element; dcThe arc spacing between array elements on the arc array; m is the total number of array elements;
is the aperture angle of the arc array antenna; λ is the signal wavelength; lambda [ alpha ]gIs the wavelength; l is the length of the transmission line between the two antenna array elements; b is a positive integer. The second calculation formula is f = c/λ; f is the signal frequency; and c is the speed of light. Wherein λ isgNeeds to be determined according to the transmission line type; when the type of the transmission line is determined to be a non-dispersive transmission line, λ g = λ; wherein λ is the signal wavelength; when the type of the transmission line is determined to be a waveguide type transmission line,
wherein a is the broadside dimension of the waveguide; lambdagIs the in-guide wavelength of the waveguide; λ is the signal wavelength.
According to the implementation of the invention, the corresponding group of antenna array elements are determined to work according to the first direction, so that the conversion of the antenna beam forming direction in a large direction can be realized, and then the signal frequency of the antenna array elements in a working state is adjusted according to the target direction, so that the scanning in a small angle range in the large direction is realized, namely the direction of the formed beam is controlled to be the target direction, and the arc-shaped array antenna beam is more flexible in pointing and simpler in control process.
Another embodiment of the present invention provides an apparatus for controlling a beam direction based on an arc array antenna, including:
the first determining module 1 is used for determining a first direction according to the target position and the circle center corresponding to the arc array antenna;
the first control module 2 is configured to control, based on the first direction, each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same;
a second determining module 3, configured to determine a target direction of a synthesized beam based on the initial direction of the synthesized beam of the first antenna array tuple and the target position;
a third determining module 4, configured to determine a target radiation direction of the radiation beam of each antenna element based on the target direction of the synthesized beam;
and the adjusting module is used for adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction so as to control the beam direction synthesized by the radiation beams of each antenna array element to be the target direction.
The apparatus in this embodiment further includes a dividing module, where the dividing module is configured to: grouping antenna array elements in the arc-shaped array antenna according to the principle that the interval distance between two adjacent antenna array elements in the same antenna array element group is equal to obtain a plurality of antenna array element groups; determining a synthesized beam direction of each antenna array group with working signal frequency as first signal frequency, and taking the synthesized beam direction as an initial direction of a synthesized beam; and obtaining a beam direction range corresponding to each antenna array group based on the initial synthesized beam direction of each antenna array group.
Specifically, the first control module is specifically configured to: comparing the first direction with the synthetic beam direction range of each antenna array group to determine the synthetic beam direction range in which the first direction is located;
determining an antenna array tuple corresponding to the synthetic beam direction range as a first antenna array tuple according to the determined synthetic beam direction range;
and controlling the conduction of each antenna array element in the first antenna array element group to be used as a working antenna array element.
The third determining module is specifically configured to: taking the initial direction of the synthesized beam of the first antenna array tuple as a zero beam direction; determining a synthetic beam offset angle according to the zero beam direction and the target direction of the synthetic beam; determining the offset angle of the radiation beam of each antenna array element in the first antenna array element group based on the synthesized beam offset angle; determining a target radiation direction of the radiation beam based on the offset angle of the radiation beam.
Specifically, each antenna array element in the first antenna array element group is respectively and correspondingly provided with a phase shifter;
the adjustment module is specifically configured to: determining a central angle corresponding to each antenna array element in the first antenna array element group based on the zero beam direction;
calculating to obtain target signal frequency corresponding to each antenna array element in the first antenna array element group by using a first calculation formula and a second calculation formula based on the target radiation direction of each antenna array element, the central angle corresponding to each antenna array element, the transmission line distance between two adjacent antenna array elements in the first antenna array element group, the aperture angle of the arc array antenna, the total number of the antenna array elements of the arc array antenna and the arc distance between the antenna array elements of the arc array antenna;
and adjusting the initial signal frequency by utilizing the phase shifter corresponding to each antenna array element according to the target signal frequency to output the target signal frequency to the corresponding antenna array element, so that the synthesis direction of the radiation wave beam of each antenna array element is the target direction.
In this embodiment, the first calculation formula is:
wherein, γiIs the target radiation direction of the ith antenna element, thetaiA circumferential angle corresponding to the ith antenna array element; dcThe arc spacing between array elements on the arc array; m is the total number of array elements;
is the aperture angle of the arc array antenna; λ is the signal wavelength; lambdagIs the wavelength; l is the length of the transmission line between the two antenna array elements; b is a positive integer. The second calculation formula is f = c/λ; f is the signal frequency; and c is the speed of light. Wherein λgNeeds to be determined according to the transmission line type; when the type of the transmission line is determined to be a non-dispersive transmission line, λ g = λ; wherein λ is the signal wavelength; when the type of the transmission line is determined to be a waveguide type transmission line,
wherein a is the broadside dimension of the waveguide; lambda [ alpha ]gIs the in-guide wavelength of the waveguide; λ is the signal wavelength.
Another embodiment of the present invention provides a beam direction control system based on an arc array antenna, as shown in fig. 5, including an arc array antenna, several matrix switch directional couplers, and a series feed network, where the system implements the following beam direction control process:
and S1, the control signal of the arc-shaped array antenna is transmitted to a directional coupler, namely a power distribution network through a series feed network and then distributed to a port a, a port b, a port c and a port d … n, and each port is connected with a 1/m radio frequency matrix switch. The signals of the a port can be respectively connected to the 1 st port and the 5 th port … (m) through the radio frequency matrix switch under the action of control signals1The signals of the + M/M) number antenna array element and the b port are respectively communicated to the 2 nd and 6 … (M) through a radio frequency matrix opening Guan Xuantong2The signals of the + M/M) number antenna array element and the c port can be respectively connected to the 3 rd and 7 th … (M) through the radio frequency matrix switch under the action of control signals3The signals of the + M/M) number antenna array element and the d port pass through radio frequencyThe matrix opening Guan Xuantong is respectively connected to the 4 th and 8 … (m)4+ M/M) number antenna array element;
step S2: the working array elements are gated through the radio frequency matrix switch, and M antenna array elements are included in the arc array antenna to form antenna beams in the working process, so that M/n antenna array elements, namely M antenna array elements, work simultaneously at each time, namely, signals are radiated or received simultaneously. The directional diagram of the arc array antenna is determined by the m adjacent antenna array elements, the antenna directional diagram is scanned in a large angle in the direction, and the radio frequency matrix switch is controlled by the corresponding gating signals to realize the scanning. The total number of array elements of the arc array antenna is M, and the relation is satisfied:
m = m.n (formula 1)
In the formula 1, n is the number of matrix switches and the number of output paths of the power divider, m is the number of antenna elements working in the arc array antenna, and n =2^ b, b is a positive integer; m is also the number of output paths of each matrix switch, i.e. 1/m of the number of output ports of the matrix switch. In order to avoid the width of the maximum working arc array not exceeding 180 degrees, the selection of the values of m and n needs to be paid attention to in practical application;
and step S3: the radio frequency matrix switch is used for gating working antenna array elements on the arc antenna array to form an effective antenna aperture, and the beam of the arc antenna working array is rotated in the azimuth direction, so that the azimuth direction large-angle scanning of the antenna beam is realized. The variation size of the beam direction of the arc array antenna, namely the antenna beam direction rotation interval, is related to the total number of the array elements of the arc array antenna, and the minimum beam direction interval, namely the beam jump degree, is expressed as:
in the step (formula 2), the reaction mixture,
the aperture angle of the arc array antenna represents the angle of a central angle corresponding to an arc arranged along the arc direction of the antenna; m is the total number of array elements. In order to reduce the beam jump, the value of M needs to be increased appropriately, and may be increased individuallyA phase shifter is added in the working antenna array element channel to reduce the antenna beam pointing interval and correct the phase error of each array element channel so as to reduce the antenna side lobe level;
and step S4: the size of the circumferential angle corresponding to a single array element of the arc array antenna is obtained, and because the arc arrays formed by the working array elements are all in the same arc condition, the shapes of array beams are the same, and the mutual coupling influence, the antenna gain, the beam width and the like among the array elements of the array antenna cannot be changed along with the change of a large scanning angle of the antenna beam in the azimuth direction. As shown in fig. 5, the circumferential angle corresponding to the kth array element can be expressed as:
in the step (formula 3), the reaction mixture,
the aperture angle of the arc array antenna represents the angle of a central angle corresponding to an arc arranged along the arc direction of the antenna; m is the total number of array elements;
step S5: the spatial travel difference of the array elements of the arc array antenna is obtained, as shown in fig. 6, the arc array is equivalent to a linear array, in the equivalent linear array, the antenna array elements are unequally spaced, the distance between the array elements at the central part is larger, and the distance between the array elements at the two ends is smaller. Because the maximum value of each array element directional diagram is respectively on the connecting line of each array element and the circle center of the arc array, the directional diagram of each array element in the direction of the maximum value of the array wave beam can generate amplitude weighting effect on the equivalent linear array. When the target is in the alpha direction, the space stroke difference between the m # array element and the 0# array element is DmMFrom the geometrical relationship:
DmM＝R[sinθmsinα+(1-cosθm)cosα](formula 4)
In (formula 4), θmA circumferential angle corresponding to the m-th array element; alpha is a target direction; r is the radius of the arc array antenna and the arc spacing d between the arc array antenna and the array element on the arc arraycAnd the total number M of array elementsThe method comprises the following steps:
is the aperture angle of the arc array antenna.
Step S6: obtaining the spatial phase difference of the array elements of the arc array antenna, which can be obtained from (equation 4) and (equation 5), when the target is in the α direction, the spatial phase difference between the m # array element and the 0# array element can be expressed as:
therefore, the spatial phase difference between the # i array element (i =0,1, … n) and the # 0 array element in the arc array can be expressed as:
the maximum value of the antenna beam formed by the arc array antenna equivalent antenna array is positioned in the direction of a connecting line between the circle center of an arc curved surface where the array is positioned and the 0# array element, so that the beam can be defined as the 0# beam;
step S7: selecting a series feed phase feeding mode to obtain phase shift values of phase shifters in array element channels of the arc array antenna, and arranging the phase shifters in a stringIn the cascade network, the phase shift value delta phi between two adjacent nodesi0Including the phase shift value delta phi provided by the phase shifteripAnd transmission line phase shift value delta phiil，Δφi0Determined by the beam pointing direction of the arc array antenna, the phase shift value of each phase shifter can be expressed as:
in (formula 9), θiA circumferential angle corresponding to the ith array element; alpha is the beam direction of the arc array antenna; r is the radius of the arc array antenna; λ is the signal wavelength;
if the series-fed transmission line is a non-dispersive transmission line
The phase shift value of each phase shifter can be expressed as:
if the transmission line uses a waveguide
Wherein
Wherein l is the length of the transmission line between the two antenna array elements; a is the broadside dimension of the waveguide.
The adoption of the series feed phase feed mode can simplify a power distribution network, reduce the phase shift value required to be provided by the phase shifter, reduce the number of the phase shifter, reduce the cost and simplify the beam control, and if the control current (or the control voltage) provided by the wave control driver is large enough, one or a few of the beam control drivers can realize the control of a plurality of serial phase shifters;
step S8: when the transmission line is waveguide, the flexible and fast scanning capability of the small angle in the direction of the arc array antenna is realized by a frequency scanning mode, if the space phase difference between the antenna array elements and the phase difference in the array generated by the transmission line reach balance, the basic phase relation of the frequency scanning mode is obtained, which can be expressed as:
in the formula 12, b is a positive integer and needs to be selected appropriately.
If the signal frequency is set to be equal to the center frequency f by (equation 12)0When the antenna beam is directed in the direction of the (O' 0) line, i.e. thetai=0 yield:
l＝λg0b (formula 13)
In (formula 13), λg0When the signal frequency is the wavelength in the waveguide, the b value is increased, which will increase the length of the transmission line, resulting in increased transmission loss and poor transient response.
When the signal frequency is from f0Change to f1When the antenna beam is pointed by theta0Scan to theta1The signal bandwidth Δ f is related to the value of b, and can be expressed as:
the relationship between the signal scanning bandwidth Δ f and the b value and the maximum scanning angle α max can be expressed as:
in formula (15), λg0And λg1Respectively, signal frequency f0And f1The increase in the value of b reduces the signal bandwidth Δ f required for the antenna beam scanning range, i.e., reduces the signal frequency variation range required for the antenna beam scanning.
Step S9: the change of the beam direction of the arc array antenna is realized by changing the signal frequency, and further, the expression when the maximum beam direction of each antenna array element is gamma when the wavelength is lambda is obtained is as follows:
θia circumferential angle corresponding to the ith array element; dcThe arc spacing between array elements on the arc array; m is the total number of array elements;
is the aperture angle of the arc array antenna; λ is the signal wavelength; lambda [ alpha ]gIs the in-guide wavelength of the waveguide; l is the length of the transmission line between the two antenna array elements;
by the formula 17, the maximum pointing direction of the antenna beam is calculated as gammaiThe signal wavelength lambda of time. I.e. the signal frequency f (f = c/λ) is calculated, so that a corresponding change of the signal frequency can be realized for γiAnd (4) adjusting. The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (9)
1. A method for controlling beam direction based on an arc array antenna is characterized by comprising the following steps:
determining a first direction according to the target position and the circle center corresponding to the arc array antenna;
controlling each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted based on the first direction to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same;
the controlling, based on the first direction, each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted as a working antenna array element specifically includes:
comparing the first direction with the synthetic beam direction range of each antenna array group to determine the synthetic beam direction range in which the first direction is located;
determining an antenna array tuple corresponding to the synthetic beam direction range as a first antenna array tuple according to the determined synthetic beam direction range;
controlling each antenna array element in the first antenna array element group to be conducted to serve as a working antenna array element;
determining a target direction of a synthesized beam based on an initial direction of the synthesized beam of the first antenna array tuple and a target position;
determining a target radiation direction of a radiation beam of each antenna element based on the target direction of the synthesized beam;
and adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction so as to control the beam direction synthesized by the radiation beam of each antenna array element to be the target direction.
2. The method of claim 1, wherein the method further comprises:
grouping each antenna array element in the arc array antenna according to the principle that the interval distance between two adjacent antenna array elements in the same antenna array element group is equal to obtain a plurality of antenna array elements;
determining a synthesized beam direction of each antenna array group with working signal frequency as first signal frequency, and taking the synthesized beam direction as an initial direction of a synthesized beam;
and obtaining a beam direction range corresponding to each antenna array group based on the initial synthesized beam direction of each antenna array group.
3. The method of claim 1, wherein the target radiation direction of the radiation beam for each of the antenna elements is determined based on the target direction of the synthesized beam; the method specifically comprises the following steps:
taking the initial direction of the synthesized beam of the first antenna array tuple as a zero beam direction;
determining a synthetic beam offset angle according to the zero beam direction and the target direction of the synthetic beam;
determining an offset angle of a radiation beam of each antenna array element in the first antenna array element group based on the synthesized beam offset angle;
determining a target radiation direction of the radiation beam based on the offset angle of the radiation beam.
4. The method of claim 3, wherein each antenna array element in the first antenna array element group is provided with a phase shifter correspondingly;
the adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction to control the beam direction synthesized by the radiation beam of each antenna array element to be the target direction specifically includes:
determining a central angle corresponding to each antenna array element in the first antenna array element group based on the zero beam direction;
calculating to obtain target signal frequency corresponding to each antenna array element in the first antenna array element group by using a first calculation formula and a second calculation formula based on the target radiation direction of each antenna array element, the central angle corresponding to each antenna array element, the transmission line distance between two adjacent antenna array elements in the first antenna array element group, the aperture angle of the arc array antenna, the total number of the antenna array elements of the arc array antenna and the arc distance between the antenna array elements of the arc array antenna;
and adjusting the initial signal frequency by utilizing the phase shifter corresponding to each antenna array element according to the target signal frequency to output the target signal frequency to the corresponding antenna array element, so that the synthesis direction of the radiation wave beam of each antenna array element is the target direction.
5. The method of claim 4, wherein the first calculation formula is:
the second calculation formula is: f = c/λ;
wherein, γiThe target radiation direction of the ith antenna array element is;
θia circumferential angle corresponding to the ith antenna array element;
dcthe arc spacing between array elements on the arc array;
m is the total number of array elements;
λ is the signal wavelength;
λgis the wavelength;
l is the length of the transmission line between the two antenna array elements;
b is a positive integer;
f is the signal frequency;
and c is the speed of light.
6. The method of claim 5, further comprising, determining a transmission line type;
when the type of the transmission line is determined to be a non-dispersive transmission line, the λg= λ; wherein λ is the signal wavelength;
when the type of the transmission line is determined to be a waveguide type transmission line,
wherein a is the broadside dimension of the waveguide;
λgis the in-guide wavelength of the waveguide;
λ is the signal wavelength.
7. The method as claimed in claim 2, wherein each antenna array element group of the arc-shaped array antenna is provided with a matrix switch, and each antenna array element in each antenna array element group is electrically connected to an output end of the matrix switch corresponding to the antenna array element group, so that each antenna array element of the antenna array element group is controlled to be conducted by the matrix switch.
8. A control device for beam direction based on arc array antenna, comprising:
the first determining module is used for determining a first direction according to the target position and the circle center corresponding to the arc array antenna;
the first control module is used for controlling the conduction of each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna based on the first direction to serve as a working antenna array element; the interval distances between two adjacent antenna array elements in the first antenna array tuple are the same;
the controlling, based on the first direction, each antenna array element in a first antenna array element group corresponding to the first direction in the arc-shaped array antenna to be conducted as a working antenna array element specifically includes:
comparing the first direction with the synthetic beam direction range of each antenna array group to determine the synthetic beam direction range in which the first direction is located;
determining an antenna array tuple corresponding to the synthetic beam direction range as a first antenna array tuple according to the determined synthetic beam direction range; a second determining module, configured to determine a target direction of a synthesized beam based on an initial direction of the synthesized beam of the first antenna array tuple and a target position;
a third determining module, configured to determine a target radiation direction of the radiation beam of each antenna element based on the target direction of the synthesized beam;
and the adjusting module is used for adjusting the radiation direction of the radiation beam of each antenna array element to the target radiation direction so as to control the beam direction synthesized by the radiation beams of each antenna array element to be the target direction.
9. The apparatus of claim 8, further comprising a dividing module, wherein the dividing module is configured to group antenna elements in the arc array antenna according to a principle that a distance between two adjacent antenna elements in the same antenna array element group is equal, so as to obtain a plurality of antenna array element groups;
determining a synthesized beam direction of each antenna array group with working signal frequency as first signal frequency, and taking the synthesized beam direction as an initial direction of a synthesized beam;
and obtaining a beam direction range corresponding to each antenna array group based on the initial synthesized beam direction of each antenna array group.
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